It seems like KVM doesn't implement the H_CLEAR_REF and H_CLEAR_MOD hypervisor calls, which are absolutely critical for memory management in the FreeBSD kernel (and are marked "mandatory" in the PAPR manual). It seems some patches have been contributed already in https://lists.ozlabs.org/pipermail/linuxppc-dev/2011-December/095013.html, so it would be fantastic if these could end up upstream.

I'm going to try to get some kind of workaround in the meantime so we can at least run on existing kernels.
-Nathan
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